Interstellar Astrophysics Summary notes: Part 5
... Orion Nebula (see Fig. 3). Their shape is formed by interactions between the disk and the strong radiation field and winds from nearby OB stars. Astronomers have also discovered large discs of material, which may themselves be protoplanetary discs, around the stars Vega, Alphecca and Fomalhaut, all ...
... Orion Nebula (see Fig. 3). Their shape is formed by interactions between the disk and the strong radiation field and winds from nearby OB stars. Astronomers have also discovered large discs of material, which may themselves be protoplanetary discs, around the stars Vega, Alphecca and Fomalhaut, all ...
MOLECULAR GAS, KINEMATICS, AND OB STAR FORMATION IN
... The rate of massive star formation is estimated from the integrated FIR luminosity (Boulanger & Perault 1988) of IRAS point-like sources, with FIR colors of UC HII regions (Wood & Churchwell 1989), detected in a CS(J=2→1) survey of 1427 sources in the whole Galaxy by Bronfman, Nyman, & May (1996). T ...
... The rate of massive star formation is estimated from the integrated FIR luminosity (Boulanger & Perault 1988) of IRAS point-like sources, with FIR colors of UC HII regions (Wood & Churchwell 1989), detected in a CS(J=2→1) survey of 1427 sources in the whole Galaxy by Bronfman, Nyman, & May (1996). T ...
ASTR 1120-001 Final Examination Phil Armitage, Bruce Ferguson
... 67. Suppose that we lived in a Big Crunch Universe at a time when it was contracting, rather than expanding. If you measured the velocities of many galaxies, you would find that typically: (a) Galaxies (except very nearby ones) were moving away from you, with the most distant ones moving away the sl ...
... 67. Suppose that we lived in a Big Crunch Universe at a time when it was contracting, rather than expanding. If you measured the velocities of many galaxies, you would find that typically: (a) Galaxies (except very nearby ones) were moving away from you, with the most distant ones moving away the sl ...
Linking Asteroids and Meteorites through Reflectance
... What’s the problem • The stars in the disk do not have enough mass to produce this rotation curve • The unseen mass is thought to be primarily in the halo ...
... What’s the problem • The stars in the disk do not have enough mass to produce this rotation curve • The unseen mass is thought to be primarily in the halo ...
transparencies - Rencontres de Blois
... Or, is MOND a summary of how DM behaves? Ubiquitous appearance of cH 0 -- acceleration at which discrepancy appears in galaxies. -- normalization of TF -- normalization of FJ -- internal acceleration of spheroidal systems (sub-gal.) -- critical surface brightness would seem difficult to understand ...
... Or, is MOND a summary of how DM behaves? Ubiquitous appearance of cH 0 -- acceleration at which discrepancy appears in galaxies. -- normalization of TF -- normalization of FJ -- internal acceleration of spheroidal systems (sub-gal.) -- critical surface brightness would seem difficult to understand ...
The Components of a Spiral Galaxy
... Physics of 21cm Line " • Hydrogen is the most abundant element in the ISM, but the symmetric H2 molecule has no dipole moment and hence does not emit a spectral line at radio frequencies. But it is detectable in the 21 cm (λ=1420.405751 MHz) hyperfine line a transition between two energy levels du ...
... Physics of 21cm Line " • Hydrogen is the most abundant element in the ISM, but the symmetric H2 molecule has no dipole moment and hence does not emit a spectral line at radio frequencies. But it is detectable in the 21 cm (λ=1420.405751 MHz) hyperfine line a transition between two energy levels du ...
The Milky Way - Faculty Web Pages
... Astronomers believe that gigantic spherical clusters of stars, called Globular Clusters, each with hundreds of thousands of stars, formed evenly around the center of the Milky Way many billions of years ago. These globular clusters are so large and bright that they can be seen from very far way – mu ...
... Astronomers believe that gigantic spherical clusters of stars, called Globular Clusters, each with hundreds of thousands of stars, formed evenly around the center of the Milky Way many billions of years ago. These globular clusters are so large and bright that they can be seen from very far way – mu ...
Hubble Space Telescope Image
... In this close encounter between two spiral galaxies, their arms are dramatically warped and massive star formation is triggered when the hydrogen gas clouds in the two collide. It is believed the Milky Way may have “cannibalized” small galaxies in the past through collision. ...
... In this close encounter between two spiral galaxies, their arms are dramatically warped and massive star formation is triggered when the hydrogen gas clouds in the two collide. It is believed the Milky Way may have “cannibalized” small galaxies in the past through collision. ...
STAR FORMATION (Ch. 19)
... Hard to detect because so faint, but by now 100s have been discovered. (Read Discovery 19-1, p. 511). It is still unknown whether brown dwarfs, which can be as low-mass as 0.01 Msun or even less, form in the same way stars do, or if some of them form like planets, in disks. High-mass stars: You may ...
... Hard to detect because so faint, but by now 100s have been discovered. (Read Discovery 19-1, p. 511). It is still unknown whether brown dwarfs, which can be as low-mass as 0.01 Msun or even less, form in the same way stars do, or if some of them form like planets, in disks. High-mass stars: You may ...
STAAR Review – Week Ten
... 12. In the center of the Milky Way is a large bulge of stars. Within this bulge lies a black hole. The Sun is located – a. outside of the Milky Way. b. in the large bulge of stars near the center of the Milky Way. c. in the black hole in the center of the Milky Way. d. near the edge of the Milky Way ...
... 12. In the center of the Milky Way is a large bulge of stars. Within this bulge lies a black hole. The Sun is located – a. outside of the Milky Way. b. in the large bulge of stars near the center of the Milky Way. c. in the black hole in the center of the Milky Way. d. near the edge of the Milky Way ...
here - SDSU Astronomy Department and Mount Laguna Observatory
... A Sense of Scale • The Sun (and its planets) and these nearby stars are part of a vast collection of stars bound by gravity: Such a collection of stars is called a “galaxy”. This structure contains roughly 1011 stars and is 100,000 light years across. ...
... A Sense of Scale • The Sun (and its planets) and these nearby stars are part of a vast collection of stars bound by gravity: Such a collection of stars is called a “galaxy”. This structure contains roughly 1011 stars and is 100,000 light years across. ...
astrocoursespring2012lec5-1-1
... appear smaller and fainter. When a telescope probes about 5 billion light years into look-back time, it can detect only the brightest galaxies, giant, elliptical galaxies – because spiral galaxies similar to the Milky Way are too dim to be seen at that distance ...
... appear smaller and fainter. When a telescope probes about 5 billion light years into look-back time, it can detect only the brightest galaxies, giant, elliptical galaxies – because spiral galaxies similar to the Milky Way are too dim to be seen at that distance ...
Kinematics of the Solar Neighborhood
... In practice the velocity ellipsoid for a given ensemble of stars (e.g. all stars of a given stellar type) is never prefectly diagonalized. The most significant term to be added to (15.13) is proportional to u(v − va ), indicating that the velocity ellipsoid lies in the plane of the disk, but is not ...
... In practice the velocity ellipsoid for a given ensemble of stars (e.g. all stars of a given stellar type) is never prefectly diagonalized. The most significant term to be added to (15.13) is proportional to u(v − va ), indicating that the velocity ellipsoid lies in the plane of the disk, but is not ...
The Universe
... interstellar medium, along with a central bulge of generally older stars. Extending outward from the bulge are relatively bright arms. In the Hubble classification scheme, spiral galaxies are listed as type S, followed by a letter (a, b, or c) that indicates the degree of tightness of the spiral arm ...
... interstellar medium, along with a central bulge of generally older stars. Extending outward from the bulge are relatively bright arms. In the Hubble classification scheme, spiral galaxies are listed as type S, followed by a letter (a, b, or c) that indicates the degree of tightness of the spiral arm ...
The Universe
... interstellar medium, along with a central bulge of generally older stars. Extending outward from the bulge are relatively bright arms. In the Hubble classification scheme, spiral galaxies are listed as type S, followed by a letter (a, b, or c) that indicates the degree of tightness of the spiral arm ...
... interstellar medium, along with a central bulge of generally older stars. Extending outward from the bulge are relatively bright arms. In the Hubble classification scheme, spiral galaxies are listed as type S, followed by a letter (a, b, or c) that indicates the degree of tightness of the spiral arm ...
Part B
... • Extremely rare (a few per galaxy per million years). They are the most luminous electromagnetic events known to occur in the Universe. • First detected in 1967 by the Vela satellites, • Redshifts clarified their distance and combined with their luminosity connected them to the deaths of massive st ...
... • Extremely rare (a few per galaxy per million years). They are the most luminous electromagnetic events known to occur in the Universe. • First detected in 1967 by the Vela satellites, • Redshifts clarified their distance and combined with their luminosity connected them to the deaths of massive st ...
Galaxies and Their Structure
... its component stars added together If a galaxy is moving toward or away from us its spectral lines will be Doppler-Shifted-e.g. motion away from us lengthens the wavelength Nearly all galaxies are moving away Hubble discovered in 1920 that V = HD where H is the Hubble Constant = 65 km/s per Mpc Thus ...
... its component stars added together If a galaxy is moving toward or away from us its spectral lines will be Doppler-Shifted-e.g. motion away from us lengthens the wavelength Nearly all galaxies are moving away Hubble discovered in 1920 that V = HD where H is the Hubble Constant = 65 km/s per Mpc Thus ...
Earth_Universe04
... • Pea size sample • Weighs 100 million tons • Same density as an atomic nucleus ...
... • Pea size sample • Weighs 100 million tons • Same density as an atomic nucleus ...
Ground-based Astronomy: Past, Present, and Future
... from the dense object. Note that you walk a long way on the surface but the radius does not change very much. The usual formula of the circumference = 2R is wrong … the circumference is smaller than you expect. This is what we mean by “curved space.” ...
... from the dense object. Note that you walk a long way on the surface but the radius does not change very much. The usual formula of the circumference = 2R is wrong … the circumference is smaller than you expect. This is what we mean by “curved space.” ...
1_Introduction
... Burning 1 kg of hydrogen releases 1.4 × 108 joules of energy. Sun’s mass = 2 × 1030 kg. ...
... Burning 1 kg of hydrogen releases 1.4 × 108 joules of energy. Sun’s mass = 2 × 1030 kg. ...
Goal: To understand the expansion of our universe.
... • Some suggested antimatter (the only way they could think of to convert that much energy). • Some suggested that the redshift wasn’t due to distance but due to light coming out of a huge gravitational well. • However the gas emitting the light was hot and diffuse (known by the emission lines) – so ...
... • Some suggested antimatter (the only way they could think of to convert that much energy). • Some suggested that the redshift wasn’t due to distance but due to light coming out of a huge gravitational well. • However the gas emitting the light was hot and diffuse (known by the emission lines) – so ...
Astronomy - Virginia Science Olympiad
... everyone’s device (same applied by event supervisor to everyone) Spring-load type CD clip found on PORTABLE BATTERY POWERED CD PLAYERS ...
... everyone’s device (same applied by event supervisor to everyone) Spring-load type CD clip found on PORTABLE BATTERY POWERED CD PLAYERS ...